C3 INTERMOLECULAR FORCES

Question 1

Intermolecular forces

Answer 1

are the forces of attraction or repulsion between molecules.

Question 2

intramolecular forces

Answer 2

or interatomic forces are the forces between atoms or ‘inside’ molecules which

keep atoms together.

Question 3

dipole-dipole forces

Answer 3

are the forces between polar molecules.

Question 4

induced dipole forces

Answer 4

or London forces are the forces between non–polar molecules.

Question 5

hydrogen bonds

Answer 5

are the forces between molecules in which a hydrogen atom that is covalently
bonded to a small, highly electronegative atom is attracted to a lone pair of
electrons on an atom in a neighbouring molecule.

Question 6

boiling point

Answer 6

is the constant temperature at which the vapour pressure of a substance equals

atmospheric pressure.

Question 7

melting point

Answer 7

is the temperature at which the solid and liquid phases of a substance are at

equilibrium.

Question 8

vapour presure

Answer 8

is the pressure exerted by a vapour at equilibrium with its liquid in a closed

system.

Question 9

forces of cohesion

Answer 9

are forces of attraction between molecules of the same substance.

Question 10

forces of adhesion

Answer 10

are forces of attraction between molecules of different substances.

Question 11

capillarity

Answer 11

is the tendency of a liquid to be elevated or depressed in a narrow tube as a

result of surface tension.